There are very few sheepcharacters (or Ovines) in the furry fandom, compared to other species. There could be any number of reasons for this, including lack of glamour or perceived exoticness, or even that sheep aren't considered sexy or yiffy enough. Or perhaps yiffy in the wrong way; there are many jokes which make reference to sheep as sex objects. They are also thought to be good for nothing but food or a source material (their fleece). This is obviously a misunderstanding.